But I don't get it to wake up. This maybe also due to the usbnet interface which the PowerBook is connected to, or the firewall on the other host (which I don't think because there is already the policy to allow everything to the PowerBook).

Recently I often use the PowerBook in "Clamshell" mode which means only hooked via Ethernet and Lid closed. Is there any way to make it start without opening? wake-on-lan would be a work-around when only suspending without halting the machine.
Then does anybody know how to disable the start chime of OpenFirmware without having OSX installed? There should be some setting accessible via OF, but cannot find in all the OF guides around._________________ppc:PowerBook5,8 15"(1440)-G4/1.67,2G | amd64:Acer Z5610 (Core2QuadQ8200),i5-3470,VMware VM @ i7-2620M | amd64-prefix:OpenSuse | Lila-Theme

well, not much idea about WOL, but about the chiime, if you dual-boot with mac os X, there is http://www5e.biglobe.ne.jp/~arcana/StartupSound/index.en.html. There you have the guide to install, and use, be it to mute or manage volume of startup chime. . If you don`t have Mac os X, i heard that you must keep pressed mute key while starting up your mac, and it shouldnt make the sound. I have a powerbook, but it`s compiling some software, so I can`t test it by myself right now. Hope it helps!

P.D.: Sorry, re-reading your post, I see you have no Mac OS X. I`ll check if there is some way to permanently disable sound from Open Firmware.

From a brief look at the kernel source, you should be getting a message along the lines "[device] suspending, WakeOnLan [enabled:disabled]" in the dmesg. If it says disabled, you might have to turn it on using ethtool.

But it is not working.
I initiate WOL like ether-wake -i eth1 00:11:24:d5:xx:xx. But neither iptraf-ng on the initiating machine nor the target machine (the running PowerBook) does report any magic package.
Connection is done via a usbnet device. Both machines are running shorewall/iptables but there isn't logged some blocked package. Maybe the usbnet can't transfer packages if there is no uplink on ethernet side, because it reports on the initiating machine when the PowerBook wakes up manually: